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WhatDate
When is it? Festival & holiday dates, sourced and free
WhatDate answers "When is...?" for festivals and holidays, with the source behind every date. • Reliable dates: each date comes with its source or logic - any differences become clear. • Regional dates: see when a day falls in your region or tradition, and why it moves each year. • Free calendar packs: festival, tithi, games/tournament and holiday sets asics for any calendar or the WhatDate app. • Private: no sign-up, no ads, no tracking. Every Date Matters. Because Everything Happens On A Date.
I built WhatDate Portal (https://whatdate.app) to answer a simple question — "what is the significance of this date?" — and to let you bring those dates into your calendar without ads, trackers, or account walls.
If you have ever tried to keep regional festivals, lunar observances, or local civic holidays in a standard calendar, you run into two problems:
1. Standard calendars (and the iCalendar RRULE spec) only truly understand Gregorian repeats. A date governed by a lunar tithi visible at local sunrise, or an equinox, or a regional almanac cannot be expressed as a simple calendar repeat rule.
2. When you look those dates up on traditional panchang or holiday websites, you are met with heavy ad walls, trackers, and a single flattened date that often ignores where you actually live.
WhatDate Portal approaches this on two principles:
1. Computed before declared
Whenever a date follows a mathematical or astronomical rule — lunar tithi and paksha, equinoxes and solstices, Easter, Hebrew festivals, or nth-weekday civic rules — the portal computes it directly in your browser using public-domain analytical astronomy (VSOP87 for the Sun, ELP2000 for the Moon, Meeus reduction). When a date is decided by human authority (a government gazette, bank holiday circular, or school board), the portal lists it as a declared date and cites the primary source.
2. A festival has dates, plural
Where you stand (your city's coordinates and local sunrise) and which tradition you follow (for example, Drik vs. Siddhantic reckoning, or Amanta vs. Purnimanta month systems) are kept as separate axes. A festival observed in Mumbai and the same festival observed by diaspora in London or Toronto can fall on different Gregorian days because sunrise and moonrise differ. The portal shows those differences honestly instead of averaging them away.
What you can do on the portal today:
- Look up any date or festival across cities and traditions, with a plain-English explanation of why two regions or almanacs agree or differ.
- Download ready-made calendar packs in two formats:
* .ics for Apple Calendar, Google Calendar, Outlook, or any standard calendar app.
* .whatdate for the companion WhatDate mobile app (an offline-first, zero-account app where imported public packs stay silent by default so 40 holidays do not turn into 40 morning alarms, and re-importing a pack updates existing dates by ID instead of creating duplicates).
The portal is completely static in the browser. There are no accounts, no cookies, no analytics scripts, and no ads.
I would love to hear which regional traditions, civic calendars, or astronomical date rules you would find most useful next, or any feedback on the calculations and packs currently live.
- Srinivas
About WhatDate on Product Hunt
“When is it? Festival & holiday dates, sourced and free”
WhatDate was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #231 on the daily leaderboard. WhatDate answers "When is...?" for festivals and holidays, with the source behind every date. • Reliable dates: each date comes with its source or logic - any differences become clear. • Regional dates: see when a day falls in your region or tradition, and why it moves each year. • Free calendar packs: festival, tithi, games/tournament and holiday sets asics for any calendar or the WhatDate app. • Private: no sign-up, no ads, no tracking. Every Date Matters. Because Everything Happens On A Date.
On the analytics side, WhatDate competes within Productivity, Privacy and Calendar — topics that collectively have 708.5k followers on Product Hunt. The dashboard above tracks how WhatDate performed against the three products that launched closest to it on the same day.
Who hunted WhatDate?
WhatDate was hunted by Pro D. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of WhatDate including community comment highlights and product details, visit the product overview.
Pro D
Hello everyone,
I built WhatDate Portal (https://whatdate.app) to answer a simple question — "what is the significance of this date?" — and to let you bring those dates into your calendar without ads, trackers, or account walls.
If you have ever tried to keep regional festivals, lunar observances, or local civic holidays in a standard calendar, you run into two problems:
1. Standard calendars (and the iCalendar RRULE spec) only truly understand Gregorian repeats. A date governed by a lunar tithi visible at local sunrise, or an equinox, or a regional almanac cannot be expressed as a simple calendar repeat rule.
2. When you look those dates up on traditional panchang or holiday websites, you are met with heavy ad walls, trackers, and a single flattened date that often ignores where you actually live.
WhatDate Portal approaches this on two principles:
1. Computed before declared
Whenever a date follows a mathematical or astronomical rule — lunar tithi and paksha, equinoxes and solstices, Easter, Hebrew festivals, or nth-weekday civic rules — the portal computes it directly in your browser using public-domain analytical astronomy (VSOP87 for the Sun, ELP2000 for the Moon, Meeus reduction). When a date is decided by human authority (a government gazette, bank holiday circular, or school board), the portal lists it as a declared date and cites the primary source.
2. A festival has dates, plural
Where you stand (your city's coordinates and local sunrise) and which tradition you follow (for example, Drik vs. Siddhantic reckoning, or Amanta vs. Purnimanta month systems) are kept as separate axes. A festival observed in Mumbai and the same festival observed by diaspora in London or Toronto can fall on different Gregorian days because sunrise and moonrise differ. The portal shows those differences honestly instead of averaging them away.
What you can do on the portal today:
- Look up any date or festival across cities and traditions, with a plain-English explanation of why two regions or almanacs agree or differ.
- Download ready-made calendar packs in two formats:
* .ics for Apple Calendar, Google Calendar, Outlook, or any standard calendar app.
* .whatdate for the companion WhatDate mobile app (an offline-first, zero-account app where imported public packs stay silent by default so 40 holidays do not turn into 40 morning alarms, and re-importing a pack updates existing dates by ID instead of creating duplicates).
The portal is completely static in the browser. There are no accounts, no cookies, no analytics scripts, and no ads.
I would love to hear which regional traditions, civic calendars, or astronomical date rules you would find most useful next, or any feedback on the calculations and packs currently live.
- Srinivas